Eleven weeks of confrontations between police and protesters have plunged Hong Kong into turmoil, and presented the biggest popular challenge to Chinese President Xi Jinping since he came to power in 2012. Demonstrators say they are fighting the erosion of the "one country, two systems" arrangement that has enshrined some autonomy for Hong Kong since China took it back from Britain in 1997.
Swedish teenage climate activist Greta Thunberg sails for the United Nations summit in New York, crossing the Atlantic on board a racing yacht fitted with solar panels and underwater turbines that produce electricity on board, with the aim of making the journey zero-carbon.
Thousands of Hong Kong residents held a sometimes scrappy anti-government protest at a suburban subway station that was attacked by a mob last month, angry that nobody has yet been prosecuted for the violence.
President Trump's proposal for the United States to buy Greenland from Denmark has met with surprise and a sharp rebuff from Copenhagen, with Prime Minister Mette Frederiksen calling the idea "absurd."